verify(urlQueueService, times(0)).offerAll(anyString(), any());
    }

    /**
     * Test getClient method.
     */
    public void test_getClient() throws Exception {
        final CrawlerClient client = mock(CrawlerClient.class);
        when(clientFactory.getClient("http://example.com/")).thenReturn(client);

        // Use reflection to access protected method